The Crew series sure has a popularity here. Might be possible. However, I don't think it would be on the main forum page like GT and Forza, maybe in the PC and Console section. But, it's not me who decides...
As far as I understand it, the mods elevate specific game threads to full on boards on the forum if they perceive it as being particularly active. I don't think it's done out of request. So if enough people are talking about The Crew 2 in its thread when it releases and for some time afterwards, then I think you can expect it to be given its own section.
Can't this be a general The Crew forum and includes the first game too? There's still people playing it and there's more than a few threads scattered in the Consoles & Gaming forum.
